复合管管端堆焊Inconel625合金工艺及性能研究
Research on Performance and Process of Overlaying Inconel Alloy 625 on Lined Pipe Ends
王小艳， 潘建新， 周华， 张燕飞， 刘振锋
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作者单位：西安向阳航天材料股份有限公司， 陕西 西安 710025
中文关键字：复合管； 管端堆焊； Inconel625合金； 化学分析； 金相组织
英文关键字：lined pipe; overlaying on lined pipe ends; Inconel alloy 625; chemical analysis; microstructure analysis
中文摘要：采用福尼斯自动堆焊机及滚轮架设备、脉冲熔化极气体保护焊方法对规格为?准219.1 mm×(14.3+3) mm、材质为X65+316L的复合管管端内壁堆焊3 mm厚、50 mm长的Inconel625耐蚀合金层，堆焊后对堆焊层进行化学分析、金相组织观察和性能测试。结果表明，在堆焊层与基层界面处化学元素扩散不严重，未影响堆焊层的耐蚀性能；堆焊层的显微组织为树枝状奥氏体；堆焊层与基层形成致密的冶金结合，界面处没有出现气孔、裂纹及熔合不良等冶金缺陷；堆焊层的硬度高于基层；堆焊后界面结合强度平均为415 MPa。
英文摘要：The inner surface of the lined pipe is in the size of ?准219.1×(14.3+3) and the material X65+316 L was overlayed corrosion resistant layer of inconel alloy 625 with the size of 3 mm in thickness and 50 mm in length by pulsed MIG welding(MIG) method with automatic welding machine of phonics and the wheel frame equipment. The overlaying layer after overlaying is investigated by chemical analysis, microstructure analysis and performance testing. The results show that the diffusion of chemical elements of the interface between the overlaying layer and the substrate is not serious, which can not affect the corrosion resistance of the overlaying layer. The microstructure of the overlaying layer is dendritic austenitic. The overlaying layer and the substrate form a dense metallurgical bonding. The interface does not generate porosities, cracks, illbond and metallurgical defects. The hardness of the overlaying layer is higher than that of the substrate. The bonding strength of the interface after overlaying is 415 MPa.